Plastic Definition and 278 Threads

My wife and I have been slowly trying to phase out plastic from our lives and well it's mostly impossible, but we've been making a large effort with food packaging, containers, and beverages. We've been switching to glass and aluminum containers/bottles. Between the microplastics, toxins, and...

Hi, I want to cover this piece of metal (A) with a plastic cover (white line B) that fits but I am not sure how that is created...do I need 3D printing?Has to be like an encapsulating plastic box that fits, hiding the underlying metal thing seen in the picture A...so the results is a smooth...

I was feeling very bored so I wanted to play with my surroundings and I had: Crafting glue: And Rubber Dust: Near me so I (for some reason) mixed them together and rubbed them on my hand. After some time it started to take a spherical shape. It lost the stickiness of glue and started acting...

I am working on my Thesis in which i synthesised PLA out of L-lactic acid. I am using the Methods from a research paper from the HEIA-FR which i linked here aswell. https://www.chimia.ch/chimia/article/view/2012_951/4616 The second step is to perform a polymerisation of pure lactic acid to a...

Howdy folks. I have a couple spares of these https://www.amazon.com/gp/product/B01NAL6MND/?tag=pfamazon01-20 and I was thinking about repurposing one as a food dehydrator. Do I need to worry about fumes? IIRC the max temp is 150F. Will one of these help...

Hi all, For those of you are unfamiliar with the concept of "retrobriting" plastic, it involves exposing yellowed plastic to UV light whilst being submerged in some variant of peroxide. This has proven to be effective in reversing the yellowing effect on old plastics. However, certain plastics...

i have a plastic handle and want to join it with a metal body. i can join it with heat stacking method i have find a product who done done that. is there any other way to join permenently?

I am interested in the potential for air bubbles in a plastic structure to expand with heat, and put pressure on the plastic surrounding the air bubble. In this case the plastic structure is formed by melting a thermoplastic powder. In between the grains of powder are voids with air in them. As...

I have been tasked with tilting a plastic 55 gallon drum that contains lube to an angle of about 20 degrees. I would like to use pneumatic cylinders as air is readily available here. The plastic barrel has a 23.5 inch diameter and is 35 inches tall. The barrel and contents weighs 450 pounds...

I think the picture says it all! As the droplets of condensation reached a certain size they begin to run down the plastic sheet, but rather than just running straight down, they veer off to the left or right. Most of the tracks are at fairly much parallel, with some exceptions, and the pattern...

Hello guys! 7 days ago I did a Blepharoplasty (eyelid surgery). It's one of the simplest plastic surgeries on the face. However, for my surprise, I was told by the doctor after the surgery that I would have to stay 4-6 weeks without heavy lifting for the scars to heal properly. I think that...

Summary:: 12 ton rectangular frame is lowered by a 4 point crane attached to each corner of the frame. Frame will be lowered onto plastic supports, these supports have guiding ramps of 60 degrees to help the operator lower the frame in the correct spot. The frame has 4 feet, one on each corner...

I like using polypropylene dishware e.g. spoon, and storage box. I can see that from its label sometimes the maximum temperature recommended is 110 degree C or 120 degree C but it usually doesn't go away from this range. By common sense, I will never heat the polypropylene dishware directly but...

I've found something growing apparently inside plastic (microwave-proof Tupperware). Two photos are appended, a bit fuzzy, I'm afraid. The whole structure is about 2 cm long and the close-up (lowest part of the overview) shows a part that's about 5 mm in diameter. I wasn't able to scratch it off...

Is there a process to break ABS plastic down into safe non carcinogenic chemicals? Maybe even down to its basic elements? Maybe an enzyme exists? I want to recycle my 3D printed objects that didn't turn out well.

hey, i was looking for information on friction coefficient of marble on plastic and iron on plastic. if you know these values i'll be very glad! thanks in advance

I want to build a spherical speaker with a diameter of about 50 cm. The frequency response should be relatively deep. Now my question is, which type of plastic is best for it and how thick does the housing have to be?

For example, I have some fingernails, I touch the mouth of a plastic bottle but the fingernail hits on the edge, I could feel it is a big hit, of course no observable damage is seen because it is just a fingernail, could this already create some microplastics that we don't see?

Is it possible to maintain an environment with low humidity to preserve electronic devices from oxidation without this low humidity drying out plastic and rubber from electronic devices and DVD discs that are plastic and in that environment? in my room I have two digital hygrometers and an air...

I have a PS2 Slim 90000 and its case is ABS plastic and it has rubber parts, this device is located on a wooden table, the lights with UV in my house and the sunlight coming into the house will dry out, crack and damage the ABS plastic and the rubber of this device? my house uses LED bulb

When detecting a muon, we can use a plastic scintillator which consists of the components in the diagram attached. I am trying to understand what exactly the "two-stage amplifier" does which is located in the top left corner in the image attached? I am unable to find any information on it online...

Hey guys. So I make pennywhistles. And its popular to make the heads out of acetal / delrin. So my question is, if I were to weld two parts together using a soldering iron or plastic welding tool, would it still be safe for mouth contact? My knowledge of this stuff is very limited. But from...

What material is the plastic market bag made of? does this material retain (hold) moisture in the bag and everything in the bag or around the bag becomes damp? i put some bags inside a cardboard box and inside the cardboard box i also put dvd cases and i am worried if the bags will hold...

a)plastic deformation because of permanent deformation b) the other parts that have been destroyed have stored the energy and this saved the passenger compartment. C) the alloy crash barrier is stronger than the car body and and saves more of the energy by deforming shape. I'm not sure about my...

I saw rubber-like silicones. Are there types of silicone that can be used in injection molding and once the process is finished - become as hard as, let's say, PVC? At the same time they should have all(/majority) of silicone's properties (citing Wikipedia): - Low thermal conductivity - Low...

Hi, I have a question regarding plastic bending of beams (assuming bilinear elastoplastic material - with or without hardening) . In literature one can find calculations of load capacity for those beams. But what else can be calculated in such case ? Stresses ? Deflection ? Where can I find...

My guess is that the deformation immediately before would be the sum of elastic and plastic deformation, and the deformation after would be just the plastic deformation, and it therefore would decrease. Is this correct?

Polycaprolactone is used as moldable plastic and you can mold in into thousands of shapes. Is it toxic like Acrylic? Does Polycaprolactone have polymerization chain as described below for acrylic? "Acrylics are not completely safe materials because their polymerization chain...

UV causes dryness of plastic and rubber and lights have UV so keeping it in the dark away from light inside boxes prevents this but notice this photo where the box where the arrows are marked the clarity q enters this region of the closed box is enough for the long term the UV of this clarity...

A chocolate company produces triangular chocolate bars. The length of the chocolate bar is x cm, and its cross section is an isosceles triangle. The length of the base side of the cross section is 3 cm, the height is h cm, and the two base angles are 50 degrees. Moreover, the company uses a...

Hi, I'm currently doing a shrinkage study upon this plastic part. I hv been observing how much can the part able to shrink over the time after molding, and now hv been on the 5th month observation. However, on the 5th month, the part starting to expand, compared with the data from the 4th...

Hi,I couldn't do this problem.I hope someone could help meths is my first time in this forum

I bought a new battery of D size today but I noticed that there is some rips (not much), I am not experienced and I certainly won't rewrap the whole battery. I'd like to know if it's okay to use fix it by taping the part with a small plastic tape??

Hi, I have a quick question about part 1 of this upper bound theorem question (in the attached image). Answer says that \lambda_c = 2.25 . First, we know that there is 1 redundancy and therefore there will be a maximum of 2 plastic hinges for failure. I have found that there needs to be...

I have been shopping around and looking at the label on different home products carefully. I am especially concerned about plastics. There are tons of different plastic products but most of them only state what it is made and where it is made without other chemical details. For example...

Hello everyone, First of all a very happy new year to everyone! And a big thank you to all the people who contribute to this forum, I have learned so much from here. I am prototyping a design for a part that will be used in a consumer product. I am in the early stages of researching...

Hello, How can I calculate the force that must be exerted on a ball inside a rubber tube? Thanks

So recently I got my first job as an mechanical engineer. YAY! The factory produces plastic products such as bottles/jar/etc with 2 main methods. blow molding for PP and HDPE & ISBM for PET. The whole area of plastic is completely new to me, my boss know that. I'm the only mechanical engineer...

I am interested in a water heater found in consumer market, however, it's made of kind of plastic, I often "feel" that there must be some problem heating up something like plastic. I understand that it should be tested and safe before putting into the market, however, I still wish to know -...

Hello, I am currently writing my thesis, where I have to investigate if a surface treatment increases the adhesion (between tape and a plastic surface). For this purpose, I have among other tests, performed a tensile test between the tape and plastic surface. The tensile test can be separated...

I got this phone and it came with this film mask thing that i think your supposed to apply to the screen, then peel it off, which is supposed to removed some film (?) But the phone already has a little tab on top of the covering that's already attached (it says A5L so you know what I am...

Does anyone have any experience with creating a hermetic seal on metal housings that are sandwiching a thin metal membrane? Specifically with the fluid leak path between the metal and the plastic.

Hello, I am attempting to expand my physical understanding of some engineering principles I’ve learned during my first semester of ChemE. I am making a small plastic car that will be propelled with a weak fan. I am attempting something similar to a ChemE project car. Is there a way I can use a...

On wikipedia (https://en.wikipedia.org/wiki/Iron(III)_chloride) it says: The ferric chloride test is a traditional colorimetric test for phenols, which uses a 1% iron(III) chloride solution that has been neutralised with sodium hydroxide until a slight precipitate of FeO(OH) is formed.[26] The...

Hi all, I think this is the right place to post this?! Material sciences.. Nonetheless, I am searching for a strong inflexible plastic, that is transparent. The principle job of the plastic is to be a long piece with a sensor attaching at the end. The sensor will weigh about 2kg, putting a...

Hello, So I've got a pet hamster which I'm trying to build an enclosure for. And so I was wondering what would be the most suitable type of plastic to use for the walls and floor. Obviously it's going to have the appropriate ventilation as the top and the front will be made entirely out of metal...

Hello! I am in a student-run engineering team that heavily utilizes fiber reinforced plastics, and I am just trying to get a better understanding of FRPs. I am wondering how exactly the fiber reinforces the plastic. Let's say the yield strength of the fiber in the 0 degree tensile direction is...

It's a tool storage box, probably made of PP (According to the label) When its lid opened, quite an obvious (but not very strong) smell coming out ,what it could be? vaporized form of plastic?

Yesterday morning, before work, I cooked eggs in canola oil in a cast-iron pan. Afterward, I rinsed out the pan and heated it to dry it. By mistake, I left the stove on. When I returned home, in addition to my house being smokey and smelling like IHOP, my cast-iron pan was lined with a...

I'll get into the details why I need this for below but first I'll explain what I'm looking for. I basically need a flat sheet of aluminum or any plastic in grey or black color that doesn't provide specular reflections, yet is smooth enough to not have any noticeable texture when looking with...